1958

7.6

1994

8.7

1984

8.0

1998

7.4

1957

8.5

1966

7.7

1932

0.0

1940

5.2

1999

6.8

1984

6.2

1988

7.2

1990

7.3

1987

6.5

1968

7.6

2004

7.2

1974

6.5

1977

6.8

1979

6.2

2006

7.9

1989

7.2